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Positronium Probing of Pores in Zirconia Nanopowders

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Prochazka I., Cizek J., Lukac F., Melikhova O., Hruska P., Anwand W., Liedke M., Konstantinova T., Danilenko I.

Acta Physica Polonica A

2017

vol. 132

issue 5

1564-1567

In the present paper, conventional positron lifetime measurements on selected zirconia-based nanopowders are reported. The nanopowders were doped with various metal cations (Y³⁺, Eu³⁺, Gd³⁺, Lu³⁺ and Mg²⁺). Lifetime experiments were conducted in air and supplemented with mass density measurements. In a range of lifetimes, from a few ns to ≈70 ns, up to two individual lifetime components could be identified. Such observations confirmed positronium (Ps) formation with subsequent ortho-Ps pick-off annihilation as well as the occurrence of pores of different size. Pore sizes were estimated using a shape-free model of the correlation between pore size and ortho-Ps lifetime. The origins of pores are discussed on the basis of the ortho-Ps data in combination with the results of mass density measurements.

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1 Acta Physica Polonica A

1 2017

1 Anwand W.

1 Cizek J.

1 Danilenko I.

1 Hruska P.

1 Konstantinova T.

1 Liedke M.

1 Lukac F.

1 Melikhova O.

1 Prochazka I.

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Positronium Probing of Pores in Zirconia Nanopowders